Lighting fixture



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3331 imau Patented Dec. 10, 1929 EBEN F. OLIVER, F JERSEY CITY, NEW JERSEY, ASSIG-NORTO KORBECTOLITE GOM- PANY, INC., OF NEW YORK, N. Y., 'A CGBPORATIQN OF NEW YORK LIGHTING irrxrunn Application filed July 15,

This invention relates to lighting fixtures and has more particularly, though not exclusively, reference to so-called flood lights. The flood lights of today contain highpowered lamps and the reflectors thereof are generally provided with a covering of colored glass. The heat generated by the highpowered lamps is considerable and, as these flood lights are frequently arranged out of doors, the variation in temperature to which the covering is subjected is considerable.

When plain crystal glass or plate glass is used as the covering there is usually no difliculty but when colored glass is employed consider able trouble is experienced owing to the fact that the properties of colored glass are different from those of crystal glass, the result being that the covering cracks and has to be replaced.

The main object and feature of this invention is to prevent this undesirable cracking of the glass front in lighting fixtures. v p

In the accompanying drawings the invention is disclosed in several concrete and preferred forms in which:

Figs. 1 and 2 are examples, in side elevation, of flood light fixtures to which the invention may be applied.

Fig. 8 is a plan view from the inside, with parts broken away and in section, of a covering for a lighting fixture.

Fig. 4 is a fragmentary sectional view substantially on the plane of finest-4 of Fig. 3.

Fig. 5 is a detail sectional view substantially on the plane of line of Fig. 3.

Fig. 6 is a detail perspective veiw of some of the parts shown in Figs. 3, 4 and 5.

Fig. 7 is a view similar to Fig. 4 but showing a modified form of the invention.

Figs. 8 and 9 are detail views showing further modifications of the invention.

1 indicates a lighting fixture having an open mouth closed by covering 2. This lighting fixture may be in the form of a reflector having a bulb 3, and this bulb may enter either from the side as shown in Fig. 1 or from the back as shown in Fig. 2. Covering 2 is composed of a support 4 suitably clamped or hinged to the fixture in a manner well understood. The support may be described 1927.. Serial No. 205,908.

as -being circumferential but by this expression it is not intended to limit the device to one having a round cover as obviously the fixture and cover might be polygonal or .irregular shaped and the expression "circum ferential is intended to include such variations in shape or form. In addition to the support, the covering consists of a light modifying medium, and in Figs. 3. 4, 5 and 6 the detail construction is as follows. port 4 is a rim that carries a plurality of brackets 5 by means of screws 6. These brackets in turn carry by means of screws 8 a rim 7 of step or angle formation and to this rim 7 is secured still another rim 9 by means of screws 10. These inner and outer rims clamp the light modifying means which here consist of a plurality of members in overlapping relation. Specifically these members are plates of glass 11, placed side by side in a straight plane, and spacing members 12, there being a spacing member be tween each two adjacent plates, and the spacing'members beinggenerally of T-shape' formation consisting of'a foot 13 and a web 14. Foot 13 is cut away at the ends as shown plainly in Fig. 6 so that the web extends over rim 7, and in one sense said spacing members also serve to clamp the plates as will be understood. 15 is an outwardly bulging and unbroken outer lens that rests on support 4 and which in turn helps to sustain rim'7. It will now be understood that the overlapping members of which the light modifying medium is composed permit a certain amount of contraction and expansion of plates 11 and that the overlapping relation of the members prevents leakage of white or unmodified light. The rims thus serve to clamp the circumferential portions of the plates and the end portions of the spacing members.

In Fig. 7 a slightlv different construction is used in that both the inner and outer rims 7 and 9 are of step formationand the spacing member 12 is of I-shape in cross section with both the front and the top of the I cut away at the ends similar to the cutaway portion of foot 13 (Fig. 6).

In Figs. 8 and 9 are shown modified forms in which the spacing members are dispensed with and the glass plates are shaped either V to overlap as at 11 or as at 11*.

I claim: c

The combination with an open-mouth reflector containing a light source, of a closure for the open mouth including: a support, an outwardly bulging and unbroken outer lens, a color medium to modify the light and consisting of a plurality of members placed side by side in a straight plane intermediate the source of light and the outer lens, overlapping means associated With the sides of said members to admit of expansion and contraction of the said members and to prevent leakage of unmodified light, and means to clamp the edges of the members and the edge of the lens to the support.

Signed at the borough of Manhattan, city,

county and State of New York, this 5th day of July, 1927.

; EB'EN F. OLIVER. 

